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Topic: Henry's Law  (Read 8043 times)

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Offline k42490

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Henry's Law
« on: December 22, 2007, 08:54:30 PM »
I have a question about Henry's law, which I know says that the amount of gas dissolved is proportional to the gas pressure above solution.

My question says: the weak electrolyte NH3 does not obey Henry's law, and O2 obeys Henry's law in water but not in blood (aqueous solution ). Why?

for NH3, I think it is because it is a weak electrolye and will dissociate in solution,  but I do not know about the O2

Offline Yggdrasil

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Re: Henry's Law
« Reply #1 on: December 23, 2007, 12:24:46 AM »
You are correct about the ammonia.  For the blood question, think about if there is anything in blood that might affect the dissolved O2 (e.g. by binding it).

Offline IITian

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Re: Henry's Law
« Reply #2 on: December 23, 2007, 06:13:42 AM »
Inside the lungs, the diffusion of oxygen into the blood triggers the reactions. The oxygen reacts with and attaches to hemoglobin (an iron containing pigment). This oxygenation reaction with hemoglobin produces excess H+ ions which react with HCO33- to produce H2CO3. The carbonic acid decomposes to CO2 which diffuses out of the blood.

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